Over the last four years, California Energy Commission has rolled out its HERSII rating system, which was designed as a way to provide a score to homeowners and prospective buyers that compares the energy performance of a house to similar homes (without occupant behavior). The HERSII system is based on the same engine that drives California Title 24 Energy Code and was identified as a key part of the State’s approach to driving energy efficiency in existing buildings.

The goal of the HERSII system is to label all California homes in order to equate energy performance with building value at time of sale, and as a way for a homeowner to get third-party recommendations as to the most cost effective options to save energy.

HERSII has been a centerpiece of the CEC’s thinking about how to implement Assembly Bill 758 (AB758), which is legislation that gives the CEC regulatory authority over existing buildings. While not explicitly called out as the solution in the legislation, the CEC has laid out a plan of attack that uses the HERSII rating as the driver to eventually mandate improvements. While there is a desire by many to consider alternatives, the HERSII policy has yet to officially change.

Before we move forward with this strategy, it is critical that we evaluate all of our options and the data from early HERSII pilots. This is particularly true in light of phase three of AB758 which includes the potential of mandating ratings and cost effective energy efficiency improvements on existing buildings.

Potential Mandatory Approaches could include:

• Requiring disclosure of energy performance and the completion of the most cost‐effective energy efficiency upgrades at appropriate trigger points in the life of all buildings, such as transactions that result in change of ownership, occupancy, or financing; replacement of major equipment; or building remodeling or renovation.

It was brought to my attention, that while the AB758 Action Plan did not discuss HERSII issue, there was an on the record discussion on HERSII at the AB758 Fresno Workshop where Commissioner McAllister and also Bill Pennington of the CEC, at which time both expressed a willingness to at least revisit or maybe even "reinvent" the HERSII program. I would like to commend them for being willing to go on the record, but I will also implore them that we need real resolution and clarity on this issue and that waiting for the next AB758 Report to emerge and then another proceeding is prolonging uncertainty that is affecting the market.

HERSII sounds great and asset ratings and third-party raters make for really nice policy white papers, but when put into practice on existing buildings, the results speak for themselves ― and don't necessarily agree with the theory. The HERSII ratings system is extremely costly, has low consumer demand, and does not result in significant conversion to energy efficiency projects.

In an attempt to develop a one-size-fits-all solution to provide an asset rating for use at time of sale and in the appraisal process and provide an actionable workscope and savings projection all in one system, we have instead created a solution that does not work well for either use.

So the big question is, will the HERSII strategy work?

The good news is that we now have results back from our initial tests of the system. However, the unfortunate reality is that the test phase has demonstrated serious shortcomings in the current theory, which should at a minimum call the HERSII system into question and hopefully lead to thoughtful evaluation of the shortcomings that emerge to avoid costly missteps for the marketplace and government programs.

Based on results from HERSII tests over the last four years, the HERSII rating system does not appear to be catching on with homeowners, nor does it seems to be driving market transformation in terms of conversion to energy savings or discernible asset value improvements (though the latter is harder to know with the current dataset). Admittedly, some of our data is a little sparse, but that is a function of how hard it is to get real numbers out of these pilots.

Can you guess when the incentives ran out?

What can we learn from the Sonoma County HERSII Pilot?

Sonoma County ran the largest HERSII pilot in the state, paying a subsidy of $700 per HERSII rating, which resulted in 100 percent free audits and ratings to customers, and unsustainably high margins for raters.

In Sonoma, we see a clear jump in the number of HERSII ratings while this lucrative incentive was on the table. However, shortly after the massive subsidy went away, the number of ratings drop immediately back to virtually the same number of ratings as were occurring before the incentive program. It would appear that even after this very expensive attempt to seed the market, there is little to no actual consumer demand in the market for ratings and one is left to wonder what happened to all the HERSII raters who got trained in Sonoma for this brief pilot, now that there is no more work.

Clearly, California does not have the funds to pay $700 or more per rating out of public funds on every home in California, so the fact that Sonoma’s 100 percent rebate pilot seemingly did nothing to jumpstart actual consumer demand is very concerning, and means an attempt to roll this system out would force California homeowners to shell out for an expensive service they are not valuing.

The fact that the Sonoma pilot program did not result in any discernable market transformation, either in terms of sustainable businesses conducting ratings or demand for ratings by homeowners, should be of serious concern.

Do homeowners value HERSII ratings?

When we look at the adoption curve of HERSII ratings during the recovery act period, we find that ratings are highly correlated to rating incentive programs and appear to have little organic consumer demand.

In fact, as is apparent in the chart on the right, it appears that these incentive programs had little lasting impact on demand in the marketplace.

When you couple this with the emerging facts related to the propensity of the HERSII system to overpredict potential savings by as much as a factor of 3x (see: Ex Ante Tool Review Findings Disposition for Energy Upgrade California Custom (‘Advanced’) Measure Savings, 1 Mar 2013), one realizes that not only is this system not working in terms of driving customers to take action, but it is failing to do so while massively inflating the level of savings and ROI being sold to the customer.

The propensity of the HERSII system to project significantly higher savings than what is delivered means that if HERSII in its present form was applied as a mandate, there would be many millions of California homeowners who would see only a small fraction of the savings they were told to expect.

This fundamental issue is based on the CEC’s attempt to create a system that is based on code, and then apply it to operational predictions of savings. These two uses are nearly opposite in terms of how a model is constructed, and speaks to the need for systems designed for the specific purpose being asked - one size fits all is not cutting it (learn more about this issue here).

The CEC may have the legal authority to regulate ratings in California, and AB758 may give the Commission the legal basis to attempt to implement this approach, however it is highly unlikely that they have the political capital to make it stick once we start subjecting real people to these outcomes.

Asset ratings may in fact have a place, but they are really not compatible with delivering actionable workscopes in the real world, and the one size fits all approach has resulted in a system that really fits nobody very well. HERSII is an expensive and complex system to deliver ratings that have significant accuracy issues, don't work for industry, and consumers don't seem to value.

Is HERSII worth the cost?

Each HERSII rating costs at least $500 and often more, based on the fact that conducting a rating consumes half a day in the field and then more hours back in the office inputting data into the California Energy Commission (CEC) mandated software tool. There is little room for substantial economies of scale.

When you consider that we have upward of ten million homes in California, the cost of having a HERSII rating done for all California homes will require California homeowners to invest $5 billion dollars in ratings - and that is just for ratings, not actual energy efficiency.

Do HERSII Ratings turn into energy efficiency projects?

California home performance contractors have a very hard time converting HERSII third-party audits into viable leads that result in customers who are ready to make energy efficiency upgrades.

HERSII Ratings conducted in Sonoma were cross-referenced with Energy Upgrade California™ (EUC) projects and it was found that conversion from rating to energy efficiency retrofit was under 10 percent (this analysis was conducted prior to 100 percent completion of the program, and until it is redone more accurately should be considered a clear directional indicator). This is especially surprising given that in the Sonoma program, unlike elsewhere in the state, home performance contractors were allowed to provide the rebate to customers for their diagnostic test-in as long as the project included a HERSII rating upon completion. Given that contractor close rates are typically 30 percent or greater, their participation in the Sonoma pilot would have been expected to inflate the actual conversion rates when compared to HERSII on the open market by third-party raters.

At a 10 percent conversion rate, a $700 rating incentive translates into $7,000 of public funds in rating incentive per closed retrofit in addition to Utility incentives, and other Energy Upgrade California program spending. Clearly this was not a cost effective way to drive demand for retrofitting.

This trend is borne out in PG&E figures for its entire territory, which shows that of the 582 homeowners who obtained HERSII ratings, only 59 projects have been completed energy upgrades through Energy Upgrade California, which pencils out to a similar 10% conversion rate. This of course compared to conversion rates of audits to retrofits that are typical of integrated home performance contractors of over 30%.

Why is it so hard to get homeowners to act on their ratings?

The HERSII process is convoluted, complex, and expensive. From a homeowner perspective, it goes something link this:

First, a third-party rater does a HERSII rating for a homeowner who shells out something like $500 for the audit and report. If that customer is interested in doing work, they bring the rating report to a home performance contractor to get the upgrades implemented. However, here is where it starts to gets tricky and the real world collides with theory.

Contractors are ultimately responsible for a project’s outcome, including its energy performance, and cost. When presented with a third-party HERSII rating, a contractor must determine if the report recommendations match the conditions he/she finds in the home. This means the contractor always must go back to the customer and do what amounts to another audit of the building to confirm recomendations, code compliance, and pricing, but — because the customer has already paid for a rating audit — the contractor has to conduct this work for free.

On a very large percentage of these third-party HERSII ratings, the contractor will end up not agreeing with either the estimated price coded into the rating (which drives the Return on Investment and ranking in the software), or they will disagree with the solution being recommended once someone with construction experience visits the site and creates an actionable workscope.

This puts the homeowner in a bind. On one hand, they have the third-party rater sporting a CEC logo on their report telling them one thing, and a contractor telling them another thing, and far too often the homeowner becomes uncertain as to how to proceed and who to trust, so no work gets done. The third-party model ends up with very low conversion rates, and is generally not a profitable source of customers for home performance contractors.

How do we move forward from here?

It is time that we focus our energies in California on moving to a market that relies on actual performance, not complex regulatory structures translated into software and a numerical scales. The web of regulation we have created has many unintended consequences, and with the advent of smart meters and big data, we have the opportunity to move beyond regulatory proxies and instead harness private markets and sources of capital. We should embrace this change as a great success of the California system, not a failure. It is time for State policy to advance and lead the nation towards a smarter more efficient model to deliver the deep energy efficiency required if we are going to hit our climate, energy, and economic goals.

In light of the results from HERSII to date, the California Energy Commission strongly considers adopting simpler approaches to providing homeowners with ratings, that are substantially lower in cost to homeowners and do not pretend to be of investment grade accuracy. One such solution is the national DOE Home Energy Score. A very simple model can be input through an API from a variety of software tools, and is simple enough to be part of a home inspection, resulting in a 1 to 10 score for the homeowner.

These simpler systems work as a way for homeowners to gauge a home's performance but will not be confused with real energy audits capable of delivering solutions to homeowner that contractors can actually build and that will deliver reliable results. We should separate upfront simple asset ratings from the more complex needs of a diverse contractor marketplace who can deliver the level of quality auditing necessary to develop an actionable workscope and a real price. Instead of applying an expensive and inaccurate comprehensive HERSII rating on every house in the State, we instead would only do an investment grade audit when there is pathway to getting a project built.We need to do more than tweak the knobs on the current model. We need to be open to new ideas and substantial change in our approach. Solutions are out there, but we need to be willing to admit that many current ideas are not working, and minor changes will not be sufficient to reverse the trend. It is time for California to step back into the lead and help the country move towards a sustainable market for energy efficiency.This process should start today by admitting that the HERSII system needs to be reevaluated based on evidence and feedback from the market. It does not matter how much we have invested, we need to look at empirical results and change course. We cannot afford to keep marching forward with the same basic theories, while hoping for different results.

New York has been requiring Total Resource Cost test for every individual measure being installed as part of an eligible project. This means that the total cost (consumer and public sector) for every single energy conservation measure implemented must be cheaper than the next least cost option to qualify for rate payer funds.

This application of TRC at the measure level has been a disaster for contractors, program goals, and ultimately homeowners who often could not qualify for incentives on projects that objectively make sense to the customer, drive deep savings, comfort and many other benefits, with the vast majority of the investment is in the form of private dollars - yet they don't qualify for New Yorks program based on the antiquated and misapplied PSC mandated use of TRC.

It would appear that in this ruling the PSC has wisely attempted to change the rules to require TRC only at a portfolio level, allowing individual measures to pass based on a combination of much more straight forward tests including Program Administrator Cost Test (PACT) and Participant Cost Test (PCT). These tests looks primarily at public incentives versus savings and not full project costs that are likely driving a range of non energy benefits not counted in the TRC equation.

It remains to be seen how this approach will work in the real world, the the PSC applying a different bar at a measure level and at the portfolio, but it does seem to be a step at least in the right direction, and the NY PSC may have cleared some real hurdles that have cut into energy savings and hurting New York business.Here are the key elements proposed by the NY PSC staff to fix Cost Effectiveness Testing in their ruling:

Staff proposes a complete overhaul of how measures and programs are screened for cost-effectiveness. Staff's proposal would continue the use of the total resource cost (TRC) test but at the sector level for each utility rather than at the measure level. Staff proposes using the TRC, program administrator cost test (PACT) and participant cost test (PCT) at the program level to supplement program assessments. Staff further proposes expanding the TRC and PACT benefits to include environmental damage assessment costs for SOx and NOx, a revised CO2 cost, and updating to include LRACS, discount rates, etc. appropriate for the E2 program cycle. Staff proposes the development of a Cost-Effectiveness Test Reference Guide, to be updated regularly, that documents the information sources, methodologies, and assumptions associated with estimating the benefits and costs of each test.

Staff proposes the development of a standardized cost-effectiveness calculation tool to provide transparency and ensure the ability to provide consistent results. Specifically, Staff proposes that all sectors, with the exception of the low-income sector and “specific targeted programs” included in the Statewide Program Plan should be demonstrated to pass the TRC on a theoretical basis. A TRC of less than one will be allowed for the excepted class of programs – the exact value will be determined as the various TRC input parameters are finalized. For assessment purposes, program level test results for the TRC, PACT and PCT should be filed as a supplemental report to the initial Statewide Program Plan implementation. Staff proposes that during the five-year implementation cycle, the program administrators, coordinated by NYSERDA, annually submit retrospective program and sector-based TRC, PACT and PCT analyses based on program performance to-date.

Program Administrators would analyze sectors that are not cost-effective using program level analyses to identify the program(s) that are causing the sector to be non-cost-effective. Program administrators would propose a corrective action plan to improve cost-effectiveness and if a second annual retrospective cost-effectiveness analysis of cumulative program performance to-date shows that the sector does not pass the TRC, any program that caused the sector to be not cost-effective for two consecutive years would be discontinued. Staff suggests that a qualified consultant be obtained to support the development of the Cost-Effectiveness Test Reference Guide and the selection and development of the standardized cost-effectiveness calculation tool.

In terms of the complexities of NYSERDA and Utility programs (and the regulators that direct them) overlapping or completing while confusing the market, the PSC has laid out a series of goals and a basic structure to move forward towards more collaboration and organizational swimlanes. How these ideas actually play out will be interesting to watch as the ruling is not heavy on details.

The Commission and other policy makers can no longer afford to think of energy efficiency and distributed clean energy resources as peripheral elements of the electric system that require continuous government support. Rather, the time has come to manage the capabilities of these customer based technologies as a core source of value to electric customers. In addition, full integration of load management capabilities into energy supply and grid management decisions will improve system wide reliability, efficiency, and resiliency at just and reasonable rates for New Yorkers. The Commission is obligated to ensure that the clean energy programs, the roles and responsibilities of the regulated utilities and the retail markets are aligned to achieve robust market driven investment that supports the deployment and use of economic energy efficiency and clean technologies as critical components of New York‟s 21st Century power system design and operation.

NYSERDA’s statewide role would include the oversight and coordination of a customer-centric model for program delivery. A key component of the model would include common statewide application forms and a fulfillment portal. Marketing messages would also be controlled through a coordinated outreach strategy. NYSERDA would continue to deliver programs and NYSERDA's efforts in each utility service territory would contribute to the utility service territory's energy efficiency achievements.

Staff would have the investor owned utilities continue their role in designing and delivering programs. However, the utilities would collaborate with NYSERDA in an effort to exploit the strengths of the different organizations, rather than highlighting each others weaknesses in the competition for energy savings.

Just about everyone I know operating in New York would agree that more coordination and cooperation between the Utilities, NYSERDA, and the Public Service Commission would be a good thing, and simplification and alignment of the various programs out there into a coherent approach to the market would be a great start.

However it would be wise to analyze in this equation the balance of not just the role of Utilities vs. NYSERDA, but also to take into account the fundamental roles of the public vs. private sector.

We have a common situation in NY where the program proposes "market transformation" but the core of the market for energy efficiency is missing. A market at its core is centered on a transaction and a price. However, the result we are trying to encourage - energy efficiency, is not being tracked or rewarded in either a timely or transparent fashion.

Rather than put in place the foundation for a market based on paying for the product that is being brought to market - savings that can be calculated based on utility bills - we have instead attempted to regulate our way to a market by essentially determining the business model for energy efficiency through regulatory and stakeholder processes. Getting this complex equation right, in advance, without feedback or selection is nearly impossible (like writing a business plan, and then operating per the plan without checking the balance sheet).

Rather the just move the deck chairs around one more time, we should look closely at the overall approach to market transformation in energy efficiency. The definition of a Market is the process by which the prices of goods and services are established. If we want to establish the market for energy efficiency, we need to start by measuring it and setting a price for savings.

The contractors I know in the NYSERDA program would prefer to see NYSERDA focus on aligning incentives with actual energy savings and move away from the current extensive regulation of the contractor business model that has defined the current program. Rather then pour money into program overhead such as layers of approvals, requirements, and software, instead if we applies only a small fraction of those dollars to make delivering real energy savings lucrative, we could unleash the power of the market to innovate and select for those approaches that deliver results. We need to send a signal back to the market, and allow those business models that work to win, and those that do not deliver results to change or exit the market.

Rather than Utilities and NYSERDA focusing on redesigning the program and executing on traditional private sector activities like consumer marketing and lead generation, the utility sector should focus on procuring energy efficiency exactly like they already do for other energy commodities. If performance risk flows to industry, and ratepayers and regulators are buying delivered savings, regulators can be freed from attempting to manage the entire process in a vain hope to regulate good outcomes and instead focus on rewarding results.

Reward energy savings performance at the meter and the market will select for business models that customers demand and that are profitable for industry based on the value of the real savings delivered.

The good news is that given the amount of money being spent on programs in this sector, we could make delivering real savings a great business model while at the same time reducing costs by decreasing program overhead.

I hope that New York can seize this opportunity to put in place the foundation for a real market where Energy Efficiency can be valued and traded as a true demand side resource, letting markets emerge and allowing programs to play the contained regulatory role that they do in others successful markets.

Based on this ruling, I think there is room for NYSERDA and the Utilities to make the fundamental changes necessary, but it will take leadership and courage to turn this ship. However, overcoming big challenges with big ideas is the only real chance we have of success.

Proceeding on Motion of the Commission Regarding and Energy Efficiency Portfolio Standard

With many initiatives in full swing to put ratings on homes and buildings across the country, there may be a lesson to be learned from recent cases where consumers have prevailed in suing car companies for promising an MPG that is not based on real-world driving.

Before you read any farther, I want to make clear that these models are not the problem, it is actually how they are being applied. Applying any predictive model to an individual building is the problem. It is up to us to use these tools as a way to manage this risk in pools, and avoid driving that risk down to homeowners. Great examples of this can be seen in the success of solar PPA and Leasing models.

Most labels, including the National RESNET HERS and California HERSII labeling system and the DOE Home Energy Score, are in fact asset scores that, similar to an MPG, score a house based on a set of average users. These scores have potentially wide variance for any particular building, and have a tendency in many climate zones to over-predict savings.

A recently released study called Modeled vs. Actual Savings for Energy Upgrade California Retrofits, analyzes predicted savings based on the CEC’s required energy modeling software, against actual results from customer bills. The study shows that California HERSII is over-predicting by and average of 50%, with a huge amount of variance between winner and losers. Resulting in more than 78% of homeowners not achieving the savings being predicted.

A recent LBNL report on the Home Energy Score called "Accuracy of the Home Energy Saver Energy Calculation Methodology" was announced with an email headline declaring that HES is now within 1% accuracy on average, which is a great result. Of course on closer examination it is clear that there is wide variance for any individual project - perhaps even wider than other tools in the study. Which of course goes back to the original issue that homeowners are truly not interested in the average, especially if they get the bad end of the stick.

"An official pilot study of 67 homes in Sutton, South London, found all of those who took the 25-year payback package rather than ten years - a third of the owners - faced repayments higher than the savings.Another study of 139 council houses in Sunderland found savings on energy bills were just 12 per cent rather than the expected 19 per cent.

"Before anyone takes out the Green Deal they have a right to know how much it will cost them and how much they will save. Relying on guesswork just isn't good enough. If people are promised savings which never arrive, they will think the Green Deal is a con."

Both the CA and UK rating systems are based on a faulty notion that relative scores are more important than accuracy. In striving to achieve a relative indicator of performance, and removing behavior (how people actually use their homes) we are left with a system that is really more about policy and theory then what matters to real people - which generally boils down to, how much does it cost, and what will I save.

The idea that we are going to put MPG stickers on every home in CA, or the US, at great expense (It will cost $5B to label home in CA alone) is a mistake. At least with a real MPG on a car it is based on actually testing the vehicle, and you are not having to test every single vehicle on the road, vs. labeling buildings where we are attempting to derive energy use from physics calculations and every house needs an expensive custom test.

"For carmakers, the new trendy thing is to have a vehicle in the lineup that gets 40 mpg. One huge problem is that fuel efficiency figures are not based on real-world driving. And automakers opt to advertise with the fuel economy figures that are most impressive -- for highway driving -- rather than lower city or average mileage calculations, which would make their cars look less efficient.

But the Hyundai lawsuit is the second one in recent months to challenge automakers over lofty fuel economy claims. In February, California attorney Heather Peters sued Honda in small claims court over the fuel economy claims for her 2006 Honda Civic hybrid. She said she never got anything close to the 50 mpg she was promised. A judge awarded her $9,867 in the case, which Honda is appealing."

In the end our goal is to save energy and drive consumer adoption. There is a distinct risk that all of our efforts may backfire when consumers come to understand how imperfect our ratings are, and when the financial community tries to underwrite investments based on energy savings that don’t really exist.

It is time that we start focusing on real data and actual savings, rather than more complicated regulatory schemes. All this is not to say that energy efficiency does not work, instead it should tell us that we need to move from energy efficiency expressed through code and complicated ratings or scores, and instead focus on turning savings into a resource that can be valued and traded.

We are in a unique moment in time where we can move past regulatory frameworks, to engage markets that can finance our long-term goals, which are simply too expensive to achieve driven primarily with public dollars.

This article is not to say that modeling is worthless or wrong. In point of fact, it is far better at predicting savings than just simple one size fits all deemed savings, and can be very good predictors of a large pool of buildings. However, we need to rapidly move from a model where we have policy anointed solutions based on long regulatory process and instead start measuring and valuing savings predictions based on actual results. Once we have a system that can measure real savings versus predictions, markets can step in, invest, and manage savings risk so that building owners and households don't have to.

If you look at the Solar industry as a guide, where in CA residential Energy Service Contracts (Leases and PPAs) are currently 75% of the market, building owners on completely insulated from risk through performance guarantees, private capital is flowing, and quality has become a function of industry.

A system built on real proven savings at the meter will drive innovation and investment, which is the path towards a real and sustainable solution that can achieve the promise of energy efficiency in the build environment.

Enough talk and theory... get the actuarial data and the market will follow!

The Green Deal in the UK is potentially a great source of learning for the US (on someone elses dime!). The basic plan is remarkably similar to the US. Put an asset label on lots of houses. Create financing tools to make it "free" to do upgrades. Require upgrades at time of sale / remodel. Solve climate change. Create jobs in a recession. We all live happily ever after.

So why does it seem to be falling on hard times and what can we learn to help us avoid a similar fate?

The government's flagship green policy to transform the energy efficiency of 14 million homes and create 65,000 jobs appears set for failure, after revelation that its own impact assessment shows the number of lofts being lagged per year will plummet by 83%.

For those who question if performance contracting can work in the residential sector, I believe the massive and accelerating growth in the solar industry, driven by solar leasing and power purchase agreements, demonstrates how aligning interests through performance contracts, with guarantees around production and maintenance risk, works for consumer, works for capital markets, and leads to scale.

While there are differences between PV and EE, there is no reason we cannot deliver business models for residential energy efficiency that have similar impacts and attributes. While the internal workings may be somewhat different, the fundamentals of providing guarantees to consumers, aligning market forces, and creating a securitizable asset that the financial markets can invest in, are within our grasp.

I would argue that the current approach to incentivizing homeowners, regulating contractors, regulating and incentivizing utilities, underwriting lending, is simple too economically inefficient to scale. It just costs too much to either bribe or require every actor in the system to do something that is fundamentally not in their interest. If you do the math on retrofitting say two million homes year (still the 50 year plan), we are talking about at least $20 Billion in spending per year, and a huge public investment to support it. We simply run out of public money well before we reach our goals.

It is time to rethink our approach, and we can learn from what is already working in similar industries and attracting the kinds of large scale capital required for us to achieve our long-term goals. Solar is a great place to start, however, there are currently similar models emerging in the commercial energy efficiency industry in the form of Managed Energy Service Agreement. Asset owners get a guaranteed energy bill from a service provider, who conducts a retrofit, often adds an energy management system, pools risk and installs measures.

We are in a new time, with new technology, and a post ARRA infrastructure to lean on. It is time we bring this thinking to the residential energy efficiency sector.